Joist



Jan. 31, 1928. 1,657,849

v. M. WITMER JOIST Filed Jan. 10. 1927 INVENTOR.

i1 TTORNEYS till Patented Jan. 31, 1928.

UNITED] STATES 1,657,849 PATENT. OFFICE.

VICTOR m. WITMEB, or mwnnxnn, Wisconsin.

Jamar.

Application filed January 10, 1927. Serial No. 180,227.

This invention relates to improvements in joists, and more particularly to steel or metallic joists.

It is the primary object ofthe present invention to provide a steel joist including a web bar embraced at its upper portions between a pair of longitudinally extending angle bars presenting a flat upper surface for the flush reception of various material for floors and roofs of buildings, and also permitting the insertion of hangers, bolts and the like.

A further object of the invention is to provide a steel joist in which the web bar is welded to the upper and lower bars and forming a strong and efiicient joist for building construction.

A further object of the invention is to provide a joist which is of very simple construction, is strong and durable, is inexpensive to manufacture, and is well adapted for the purpose described.

With the above and other objects in view, the invention consists of the improved joist and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fig. l is side view of the improved joist; Fig. 2 is a cross sectional view thereof taken on line 2-2 of Fig. 1;

it .e is a side View of a slightly modi fied orm of the invention; and

Fig. l is a cross sectional view thereo taken on line 4-4 of Fig. 3.

Referring now more particularly to the drawing it will appear that the numeral 6 indicates the bottom bar of the joist and the same is comparatively flat and rectangular in cross-section as shown in Fig. 2. The end portions of the bottom bar 6 are bent angu arly upwardly, as at 7, and then outwardly parallel with the intermediate portion, as at 8. I

Welded at its points of contact with the upper face of the bottom bar 6 and extending upwardly therefrom is a web bar 9 of angular formation. Said web bar is preferably, although not necessarily, square in cross-section, as shown in Fig. 2.

The apexes of the web bar 9 are secured between a pair of longitudinally extending top angle bars 10, as shown in Fig. 2, said portions of the web bar being welded to the inner faces of the top bars. The angle bars are positioned as shown in Fig. 2 with the facesllthereof at the top and in a horizon tal plane.

In use, the end portions of the joist are supported on beams 12 and dueto the arrangement of the angle bars 10 with the portions 11 u permost and horizontal, a flat.

top is provi ed especially suited for supporting nailing strips, metal fabric, and the ike. Also between the apexes of the web bar there are spaces between the inner faces of the angle bars 10 through which hangers,

bolts, or the like may be extended, as required for fastening various articles. It should be further observed that all of the joist are of steel construction. I

In the modified form of the invention shown in Figs. 3 and 4 the angle bar-s10] .75

are reversed with respect to their arrangement in Figs. 1 and 2, the faces 11 being lowermost and horizontal. This arrangement adapts the angle members for the sup,

port of variousforms of floor and roof ma From the foregoing description it will be;

terials and units.

.70 portions seen that the improved steel joist isof veryjf simple and novel construction, and, is well f adapted for the purposes set forth.

What I claim as my invention is: e 1. A. joist, comprising a fiat bottom memher, a pair of angular top members, and an elongated intermediate member secured at various intermediate portions to the upper surface of the bottom member and to the top members, the upper portion of the intermediate member being interposed between the tpp members.

2. A joist, comprising a flat elongated bottom member with angular end portions, a pair of separated right-angularly sha ed top members, and an intermediate mom or secured to the upper face of the bottom membar-and also secured to the top members, the upper portions of the intermediate member'being interposed between here. i a I 3. A joist comprising an elongated flat bottom member, a pair of angular top members and an elongated intermediate mem ber secured at various intermediate portions the top mem-v to the uppersurface of the bottom member and tothe top members, the upper ti I i of the intermediate member being interposed between the top members and holding the same in spaced relation.

4;. A. joist, comprising an elongated flat bottom member, a pair of elongated angular a pair of right angulafrly shaped elon ated top members and an angularly bent web top members, and an angularly bent we bar 10 bar connected at a plurality of points at its welded at its lower rtions to the upper lower portions to the upper face of the botface of the bottom p ate and welded at its 5 tom bar and at its upper ortions to the top upper portions to the inner faces of the top members and interposed etween the latter. members and interposed between the latter. 5. A joist, comprising a flat elon abed bot- In testimony whereof I afiix my signature. tom plate member with angular en portions, VICTR M. WITMER. 

